ACROSS 2.   7 down minus 482 4.   Number of weeks in a year 5.   Number of days in four weeks 7.   Seven times nine 8.   8617 re-arranged 10. 15 down plus forty-two 12. Quarter of 100 13. Half of 10486 15. Half of 10 across 16. Quarter of 4 across 17. Four times twenty-two 18. 82+62+78 DOWN 1.   Four times eight 2.   12 across minus 16 across 3.   1640 doubled 4.   6 down minus 5 across 6.   Nine times nine 7.   Five times 121 9.   Half of 1450 11. 716 doubled 14. A third of sixty-three 15. Number of hours in two days 17. Half of 164 19. 100 divided by five